Specifications

RoadRunner USERS GUIDE
65
Line 1. If you connect using Line
2, the selected lines must be
changed.
RoadRunner
connects and
frames in both
directions,
does not pass
audio or
passes audio
in only one
direction
—Scale factor protection
mismatch.
—Decoder independent
setting mismatch.
—Wrong input channel
selected
—Output muted
1. If encoder scale factor
protection is enabled, far-end
decoder scale factor protection
must be enabled.
1. Decoder should be dependent
for most applications. Must be
independent to frame to non-
CCS/MUSICAM USA
products.
1. On stereo codecs, only left input
is used for mono. Check
copy/swap mode, if available.
1. Check decoder mute mode
Echo
It is impossible for any codec, from any manufacturer, to introduce
echo into the audio. If you are hearing echo, your own audio coming
back with a slight delay, it must be something external to the codec. The
most common causes of echo are open microphone/speaker feedback
or improper mixer configurations at the far-end.
In very rare instances, feedback may be caused by
Connection Problems (ISDN)
Connection problems are harder to troubleshoot since more than the
codecs are involved. Connection problems may be the fault of the codecs,
but can also be related to the terminal adapters, wires, local telephone
network, long-distance service provider, etc.
Symptom Possible cause Solution
RoadRunner
connects,
line(s) drop
after time.
—NT1 failure.
—ISDN problem
—External terminal
adapter.
1. Replace NT1 if so equipped.
1. See text below.
1. Older external terminal may be
incompatible with certain ISDN
configurations
RoadRunner —ISDN not provisioned 1. Check SPID and ID numbers